So what temperature would you recommend? And how long of a time period should I drop it? Also I still don’t understand why my parameters are unstable. I did take a sample to Pure Reef and it confirmed my results. I use Hanna checkers for dKH, PO4 and pH, handheld refractometer for specific gravity, Seachem kits for Ca+ and Mg+ which were recommended by Pure Reef and Seachem test for NO3
Most all parameters fluctuate throughout the day. People run their refugia on opposite light schedules to stabilize pH as the photosynthesizing algae will help stabilize pH. dKh, calcium, magnesium are used up by corals to varying degrees depending on coral type and the amount of coral. PO4, NO3 are influenced by bioload of the tank and the food you are using. The most important things would be to test at a consistent time and one a consistent schedule (both of which I admit I'm terrible at doing). Once you determine your normal dKh, alk, mag consumption, you can work on a dosing schedule to maintain those parameters. That schedule could be as simple as small more frequent water changes. That would also help keep PO4 and NO3 in a range you want.